using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Diagnostics;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WinForm

{

    public partial class MainForm : Form

    {

        public MainForm()

        {

            InitializeComponent();

        }

        /// <summary>

        /// 后台要执行的操作

        /// </summary>

        private void AAA()

        {

            for (int i = ; i < ; i++) //模拟耗时的操作

            {

                if (i %  == ) //每隔9999999次循环ui更新下百分比

                {

                    this.label1.Invoke((Action<int>)delegate(int a) //在控件对象所在的线程上执行委托

                    {

                        this.label1.Text = a.ToString() + "%";

                    }, i / );

                }

            }

        }

        private void button1_Click(object sender, EventArgs e)

        {

            ((Action)AAA).BeginInvoke(null, null); //调用委托的异步执行方法，回调函数为空

        }

    }

}